Item bug

I lost an item in my invnetory im guessing it might have been sold to a vendor by a mistake, i dont think so but might be possible, i dont know i didnt delete it since it would ask me to retype DELETE , the item was in my off hand Scourlords Baton, is there a way to check if it is there or not, in vendor ive sold more stuff so it isnt there anymore is there a way to get it back anyhow?

Try disabling all your addons because some are known to hide stuff from your bags.

If you sold it to a vendor and it's not in the buyback tab then you have lost it.