Need help identifying, validanting and finding out the worth of these coins

3.7-8 cm 14 grams

4.5 cm 27 grams

#1 is clearly a modern replica of a Kingdom of Macedonia tetradrachm.

By coincidence, seen a similar one with my local coin seller last weekend.

#2 is supposed to be N#8472 .

Supposed because I'm 99% certain that's a replica too.

how can i test to know if the second one is actually a replica or not? Also how much would they be worth knowing that theyre replicas

Silver usually doesn’t rust. Bet it is magnetic. 

Both are fake unfortunately