Most businesses take an inventory. It's fairly routine. I have seen a harsh stigma develop over the whole process, which might be only in my head. It can seem insurmountable having to staying late or to accomplish an additional task throughout an already busy day. In those cases it's best to get a plan. We have it down to a science with our check list and work flow instructions. I break it down two a rules 1) Every frames needs a legible tag 2) keep investigating till you figure it out. Columbo might have been a good Optician.