Collector Joe Yetman told The (St. John's) Telegram he paid $32 to send a registered and insured parcel from his home in Newfoundland to another collector in Ontario who had purchased the cards through eBay.
Yetman sent them Jan. 2 from a postal sub-station, insured for $1,100. He said after 10 days the buyer told him they hadn't arrived.
Canada Post spokeswoman Genevieve Latour told the newspaper postal inspectors determined the bar-code had been collected for shipment, but disappeared from the system after that.
"We've done everything we could. It's nowhere to be found," Latour said.
Yetman was paid his $1,100 insurance claim, she said.
Yetman's now offering a $2,500 reward, hoping knowledgeable collectors will spot someone selling the cards of Toronto Maple Leafs and Montreal Canadiens hockey greats, the newspaper said.