I know, but it's his worker who had the money so there's a possibility that the worker is still around. @SKlipz do you still remember who the worker is?
If DHCP is enabled your PCs will automatically be assigned a different IP but they will have the same network IP. So I suggest you use a proxy for at least one of the accounts.
Thanks, I've hidden the evidence. @Dutchpower will have to refund you if he ever wants to return. Yes, @Dutchpower is already banned, but that doesn't mean we don't need valid evidence incase he appeals and wants to refund.