Determining available #'s for giveaway

I had entered in the LAV rifle giveaway and then found out my number had already been picked before me. What is the best way to search for a 3/4/5 digit # in a 50 page thread? (Will also help with future contests.)
-Thanks

we need a better method for sure.
after 4-5 pages of random numbers, I didnt bother to enter.

A kind soul took the time to print up a chart on post #862 that showed every available number up to that point.

Pick a number, go through the remaining pages, hit Ctrl-F and plug in your number to see if it’s taken subsequent to that post.

It’s pretty easy.