I have been working in the End, and I was transferring and placing shulker boxes from the Overworld to the End. I placed 5 shulker boxes (and a crafting table), all completely full, in the End, and came back to find that they were all gone. I've checked anywhere they could've possibly been, but to no avail. I gone was at most maybe 2 minutes, so it is highly unlikely that endermen could've taken all 5 shulker boxes (if they can even pick them up) and the crafting table and transported them somewhere else. I also thoroughly checked the End island and did not find the missing boxes or crafting table. What happened here?
edit: The shulker boxes were placed on this obsidian in the room.
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Is there any way I can get my stuff back? Or is it a lost cause?

Unless you have made a backup, it is not possible unfortunately.

Thank you for your report!
We're tracking this issue in MC-902, so this ticket is being resolved and linked as a duplicate.
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Duplicate of MC-902.