OT - eBay purchase

Recently my step-son asked me to buy a ukulele for him off eBay. It was a fixed price listing. I did so. On Thursday the UPS man comes with two packages. The guy shipped TWO ukes by mistake. I email him and tell him this and he asks me to find the cost for mailing one back to him. Well, he charged me $21.95 for shipping. Do you think it is reasonable for me to charge him the same amount to ship one back?
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don
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Experience the World through Numismatics...it's more than you can imagine.
Todd
DPOTD-3
'Emancipate yourselves from mental slavery'
CU #3245 B.N.A. #428
Don