WoW: Keep your anniversery gift forever, give Alt Xp boost

Using this exploit you are able to keep the anniversery gift. You can also give an alternative character a boost. 

1) Your loot package must be opened.

2) Pop a XP bonus if you have one. 

3) Buy some wrapping paper from a vendor.

4) Re-Wrap the anniversery present with XP bonus.

5) Mail it to anyone and it will become non-temporary.

This has worked for many years. It is how everyone was able to keep it.