Whodunit?

Rav Yitzchak Zilberstein discusses an interesting incident in his sefer Chashukei Chemed on Yoma (86b). There was an apartment building in Eretz Yisrael with 16 units. Quite possibly, the building lacked an elevator. Schlepping a stroller up and down the steps could be a real pain. Therefore, some families chose to leave their strollers near the entrance.
One family always left their stroller right in front of the staircase. Other tenants were constantly telling the offending family that the stroller was always in the way, but to no avail. After enduring months of apathy, one tenant decided to resolve the situation. One day, when the offending family came down and expected to see the stroller, they saw only a pile of ash.
No one knew who had burned the stroller. The culprit felt remorse for what he had done and paid the offending family for the extensive fire damage. He then asked Rav Zilberstein if it was permissible to tell the other occupants that it was he who had burnt the stroller.
The Gemara says in Sotah (7b) that Yehudah’s public admission that he erred served as a motivation for Reuven to likewise admit that he sinned. Rachel Imeinu died during the childbirth of Binyamin and was buried in Beis Lechem. Shortly thereafter, Reuven committed a significant misdeed by interfering in his father’s personal matters when he moved the bed of Yaakov from the tent of Bilhah to the tent of his mother, Leah. When Reuven heard Yehudah publicly declaring that he erred, Reuven likewise publicly admitted to his misdeed.