I recently won an item on a maiden bid, hence a good price (seller ended on a Monday lunchtime and spelt brand wrong

).
Paid by PP immediately and waited.
After four days waiting got in touch with seller who said he put in the Royal Mail Parcels the same day (no insurance offered, but RM parcels cover cost as standard). After several emails I agreed to wait 'til end of two weeks so he can claim of RM, but still no parcel.
He will be giving a full refund (have told him to make sure it's a PP 'refund' to stop charges).
Question is, if it is an innocent 'lost in post' (rather than didn't like the final price) and assuming it is a full uncharged refund, should he get a postive feedback, neutral or none? (Already left me a positive, and he has about 250+)
Thoughts on a postcard, please