Two bear cubs were found inside of a locked dumpster in Lutsen, Minnesota. They managed to get inside with the safety bars in place but couldn’t make their way out. The momma bear was in a nearby tree where both bear cubs retreated to upon their release.
We had a similar thing happen with a pine marten at our dumpster and had to place a makeshift ladder for it to crawl out. We have had numerous problems with bears getting into our dumpster but never with them not being able to get out.