I just had a catastrophe happen on my island. Lost my bucket, the diamond pickaxe joecobo gave me, and somehow have a ton of lava source blocks floating in the air going all the way down to the void. I was wonder, if I give someone all of the accrued material that I have gotten from my chests, could I get them back if I start a new island? This incident actually has me feeling bad, because I was finally getting somewhere with actually building on my island to make it spiffy.
You're allowed to do this, as long as they don't hold any illegal trade starter items for you (like bucket, soul sand, etc.) But like LMurph said, make sure it's someone trustworthy. I don't mind doing it for you if you catch me online, my IGN is King_Pooperton. I should be on tomorrow a good bit.
We check /warp ptp everyday so if you do put them in /warp ptp and go and get them after, we do not wish to see illegal trades. Otherwise, if you want the old items to a new island, then go ahead and do it.
Thank you everyone! Someone helped me move, and I threw all the blocks I couldn't take with me over the edge.