I am sorry to hear this happened to you. If you were unable to click "YES" on the blue boxed message more than likely that item is lost. I have had this happen to me, I can tell you to clear your inventory and blah, blah, blah but honestly the quickest and fastest solution is to contact the seller and have them re-deliver the items to you. I have never had a merchant turn me down yet and I have probably contacted 20 of them over the course of the years. First you need to find the details of the sale at the Marketplace. Sign onto your marketplace:
Click My Marketplace in the top right
Select My Account from the dropdown menu
Then at the left sidebar click Order History
Find the invoice for the item you lost. Make a note of the named after the phrase, "Sold by" that is the seller.
Copy all the transaction information.
The seller is the inworld avatar who received the payment for the item. Go inworld and create a notecard detailing what had happened to you, paste the transaction information onto the card and then drop this notecard to the Seller via their profile.
I usually give them 24 hours to respond. More than likely he/she will drop the item you bought directly onto your profile.
Hope this is helpful