DO NOT leave a neg, you don't know if they ever received the package so they don't deserve a neg.
Save the feedback...I just this week had an amazing thing happen...
Dec 12 - buyer wins widget
Dec 13 - buyer pay via PayPal
Dec 15 - I ship (lettermail)
Jan 3 - buyer emails...not yet rec'd)
Jan 4 - I ask buyer to be patient until the 15th
Jan 16 - buyer files INR via PayPal
Jan 18 - I refund (no tracking so I would loose anyway)
Jan 19 - buyer agrees to mutual cancellation
Jan 20 - we both leave feedback (nice)
April 6 - buyer emails, widget finally arrived, would like to pay me!!!!
April 7 - I send buyer a PayPal money request
April 7 - BUYER PAYS!!!!!!!!!!!!!!!!!!!!!!!!!!
Incredible but true. Of course you may not have the same luck but if you neg now I'd guess for sure the buyer will neg you back and if your widget does show up I doubt they will let you know about it.
My saint of a buyer has almost 5,000 Positives ALL from sellers and not a single neg!
Post the item number so we can look at your buyers profile.

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915

"What else could I do? I had no trade so I became a peddler" - Lazarus Greenberg 1915
- answering Trolls is voluntary, my policy is not to participate.