Heirloom bought with coin, lost in the Nether ???

Could someone direct me or re direct this post to the good place.

i bought an Arcanite Reaper on April 19, 2018 at 3:50 with coin with this account.

Been awhile since i been looking around my als to find it back and i must end believing
my heirloom simply just vanish as i cant find it anywhere.

Yes i looked alt banks,mailbox,bags,under my pillow,everywhere.

If its possible it would be REALLY appreciated if i could have it back,thanks alot

P.S: Sorry for my Grammar,english ain't my main language.