Shipping Snafu

So far in my journey to bead tycoon status I've made four sales on my Etsy online shop.  The last sale involved a lot more customer service than any of the others.  The customer convo'd (contacted via the Etsy communication system) me with a request to adjust the length of a bracelet he wanted to order.  I contacted the buyer to let him know I'd be happy to make the change.  He then ordered the bracelet.  As per my shop policies, I wanted to send the order out inside the 3 business day time period, but I was having trouble getting more of the exact type of chain that I used for the bracelet in the picture.  I convo'd the buyer with pictures of the original chain and a chain that was as similar as I could get, and asked if the change would be OK with him.  He convo'd me, saying no problem.  So, I made the bracelet, and shipped it out by US Post Light Packet on December 6th.  (Through Canada Post, of course.)  This was within the 3-day time limit promised in my shop policies.  I then emailed the buyer to let him know that the package had been shipped.  Mission accomplished...or so I thought.