question about collectible Sony ICF-2010

Hello,

I recently sold a complete original Sony ICF-2010 set to a person in
Japan for $260 via eBay. You can see the item here: http://tinyurl.com/32438q
..

The buyer is a collector, and I didn't realize that putting packing
tape on the box and scotch tape on the interior foam slipcase would
diminish the value of the set as a collector's item.

To compensate for my mistake, I am going to refund part of the
purchase price.

My question to the group is: How much should I refund? That is, how
much value does the tape take away from the set as a collector's item?

Thank you,

Jeff

.

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