-Trim fingers cleanly, process them with AP or diluted Nitric 37% (I use Nitric cause its cheap for me here), dissolve in HCL-CL (4/1), precipitate with SMB and follow the steps for washing the precipitated gold.
-Collect the chips for further processing or sell them if you have many.
-Don't throw the PCBs, keep them for further processing if they are plated.
I read somewhere that you can sell PCBs by tons even if they are unpopulated.
i keep them for future and i always use one as heat blocker when i solder components with heat gun so nearby components don't get affected.