You may find gold bond wires in that black epoxy. Here's hoping you don't get skunked by aluminum! The board itself is not very "high grade", as a board sorting company would grade it. But it does have some potentially nice chips!
rj45 round pins are better than the partially-plated flat ones I find in most consumer rj45, but only your testing can tell you for sure, and you can only compare against other items you've also tested. I've found similar type of pins, from an old ethernet patch panel made back in teh 80s and installed by a telecom service provider, and testing did result in little empty tubes of gold that were much nicer than anything else I've gotten from test dissolving pins. I could still stir a toothpick at it and bend it in half, but it stays in one piece. But it's also the only thing I've gotten from that market segment; everything else is consumer or business market.
From what I've read, it seems that ICs have the highest potential for yielding the most gold, but pins are much easier to process even though they yield much less gold. I like to joke that ICs contain SOLID gold, instead of the plated gold on everything else. If you can consider that a gold wire is solid gold no matter how thin.
But I do sometimes look at my sorted pins and think "how pretty!"
