Mick Swasko of The Chicago Tribune's Red Eye publication says the cake, the centerpiece of Wrigley Field's centennial anniversary celebration on April 23, was disposed by the Field Museum of Natural History without it ever being eaten.
The person who did away with the cake then posted a photo of the trashed cake on his Reddit account.
"Wrigley and the Cubs had their birthday cake, and no one ate it, too.
"The 400-pound 'Cake Boss' created birthday cake for Wrigley's centennial was a spectacle at Wednesday's celebration. Now, it's apparently being hauled away to a dumpster on a forklift.
"A Reddit user posted a series of photos Thursday morning of the massive cake as it was headed to the dumpster.
"'I have the task of disposing the 400-pound Cubs cake' he wrote as the title of the post, nothing that he was waiting for a forklift to carry the the behemoth confection.
"It appeared in his photos as though most of the structure hadn't been eaten, or even touched.
"The Cubs expressed frustration with the decision to scrap the cake, saying it was sent to the Field Museum for a charity event but the decision was made not to serve the edible portion over concerns that it was outside most of the day."
The team says the cake's mostly inedible portions are not enough to justify how it was disposed of, per Swasko.
"The Chicago Cubs are disappointed in how our Wrigley Field display cake was disposed of the Field Museum following our successful charity event. The team made a decision not to serve the edible portion after the cake was on display outside Wrigley Field for most of the day.
"Though the cake was mostly made up of non-edible material, it certainly does not excuse how a celebratory cake artfully created by Buddy Valastro and Carlo's Bakery was handled."
Swasko also obtained a statement from Field Museum of Natural History spokesperson Nancy O'Shea which reads,"We value our relationship with the Chicago Cubs. We regret what happened and are taking steps to ensure that nothing like it happens again."
ESPN Chicago's Jon Greenberg says the Wrigley Cake disposal reminds many Cubs fans of a dumpster incident from the fall of 2013.
"The casual dumping of the cake reminded many of a previous dumpster incident last fall. While reporters waited for news that Dale Sveum was fired as Cubs manager on Sept. 30, an ESPN Chicago reporter found giant condolence cards signed by fans after the death of Ron Santo in the dumpster outside of Wrigley.
"The pictures quickly went viral and the Cubs apologized for the accidental disposing of the items in plain view of reporters."
Greenberg also tried to reach Carlo's Bakery, but his voicemail was not immediately returned.
Joe Popely of the Cubs' official website writes more about Wrigley's 100th birthday on April 23, with a special emphasis on the cake.
"From prime boxing matchups to NFL championship teams, Paul McCartney and the Wings to Cubs pennant chases, conventions to a six-touchdown game, Wrigely field has seen it all. The Cubs pulled out all the stops Wednesday for one of baseball's most beloved and cherished ballparks.
"It truly is the Party of the Century at the iconic stadium, which celebrated the 100th anniversary of its first major-league game between the Chicago Federals -- who called Wrigely home for two years before the Cubs moved in -- and the Kansas City Packers.
"Even inanimate objects deserve birthday cakes when they turn this old. The Cubs designed a Wrigley Field replica birthday cake near the corner of Clark St. and Addison St. that was roped off."
The Cubs have an all-time record of 8,704 wins and 8,603 losses through April 28, per Baseball-Reference.com.
A photo of the trashed Wrigley Cup replica cake can be seen here.