I had a buyer win an auction last year on a Saturday night. They paid within the hour. Sunday morning I got a rather terse message "where my item? I don't receive my item. Why you no send?". I decided to ignore it thinking maybe they had me confused with another seller. Monday morning, 6am, I received almost the exact same message "where my item? I don't receive my item. Why you not post my item?". I sent them a reply stating they had paid on Saturday night. The post office isn't open Saturday nights or Sundays and 6am Monday it is still closed. I said I would be posting it that day.

Tuesday I got a message "my item still no arrive. Where my item? I paid and you no send". I replied telling them to check their purchase history as the tracking number showing I had posted their item would be there. I also pointed out that it takes longer than 18 hours for an item to go from regional NSW to far north Qld. If they had wanted the item quickly, they should have selected the express post option. Even then, that still takes 2 days.

Friday, I got a message and I nearly gagged before opening it "my item arrive today. I am so happy, thank you". Then I noticed my feedback score had increased by 1. I figured at the very least I'd get a DSR defect, but was originally expecting a red dot. Checked it and the feedback said "the best seller I have bought from on ebay. Very honest". PLUS, I got 5 stars for everything. Turns out he was just so excited about getting this particular item, he was like a 6yo kid on Christmas eve.

Hopefully this is just the case with your buyer. I got the impression from my buyer that English wasn't their first language, so as you said, maybe your buyer was born overseas in a country that doesn't observe Easter. If they haven't been here that long, they may not realise that it's a 4 day long weekend. Especially if they live somewhere where the whole ares is just their own people who would still be trading on those days. Fingers crossed any way!