If feedback was left unintentionally or prematurely and the items are not received then I would say no the deal is obviously not done. You should be able to track the package and determine what's going on. If you are unable to do so and the package isn't received in 10 days i would offer a refund or substitution if it can be agreed upon with the buyer/trader.
Hopefully it gets to the destination and all stays positive.
GL with unique situation.
If you PM me with a lowball offer I am going to Quote it in the Original Post. If you want to lowball, be brave enough to do it in the thread.