Have you really wanted to keep an item in your popit without profile corruptions wiping out everything you have? No problem! Just follow these simple steps!
No.1: Take the item you want to immortalize and send it to an alt account.
No.2: Now go on this alt account and send the item back to your main account.
No.3: You're done! Now all you have to do to get said item back is to just open the LBP Messages tab in your pause menu and find the message with the object and open it.
And the best part is no matter what, unless there was something like the servers being shut offline, you can always get the item back!
This is an interesting idea, clever thinking! I can think of a few limitations, 1. It doesn't work if the servers are down (as you already mentioned) 2. You can only open the LBP message gift once I think a better solution for object archival/long term storage would be to create vault levels. These have prize bubbles organized behind doors that you can collect at any time in play mode. You can back up the vault level and export it to external storage like a flash drive where you can preserve it.