IRS Scammers

I got cold called from the following two numbers this weekend.

646.859.6590

515.209.3221

These numbers didn’t work for me but I’m using a text free app so my real number doesn’t show is this why or do you think the numbers are already gone? I can never find a working scam number I’ve been trying now for last 2 days and I’ve had zero luck lol I want to mess with them so bad lol