What's the chance of this?

[bigborefan]

I won an auction on Ebay of Ed Tinkers for a mag for my 1939/42 luger. while it wasn't a match, but was within 4000 of my sn. Would you believe that less than 10 hrs later, I found and bought its mate on Gunbroker. Both were identical in number font, proof mark and letter. The one on Gunbroker had the plus symbol to indicate the spare mag. What is the chance of finding matching mags on two seperate internet auction sites the same day. While not as good as finding a matching mag to your luger, it's still must be astronomical odds to accomplish this. I think I'll buy a lottery ticket.