ask steam support by open a ticket here on steam under help

Check your transaction history. It's possible the transaction was cancelled because the funds were fraudulent so the item was returned or is in the process of being sent back. The pending process is to check things like this so ensure the item isn't already back and if not, contact support after checking your transaction history.

restart steam

引用自 LarryLongToe：

I recently sold an item on the market, and steam sent me an email saying that they would hold my funds for 5 days. It has been 7 days now, and the funds don't even show as pending in mt steam wallet, and I am concerned that my 2.70 has been stolen by our dearest gaben.

How should I try and fix this?
Thanks!

checked your transaction history and contact steam support.

引用自 J4MESOX4D：

Check your transaction history. It's possible the transaction was cancelled because the funds were fraudulent so the item was returned or is in the process of being sent back. The pending process is to check things like this so ensure the item isn't already back and if not, contact support after checking your transaction history.

Thanks for this, I'll check it out soon.