Where on the cash drawer is the lock number located? Is it the number etched on the lock itself, just below the slot, or is the lock number inside of the cash drawer somewhere?

Yes, that is correct. The lock number is etched on the lock itself where you insert in the key. It should be a 2 or 3 digit number.

I have 2 separate register drawers one is a Epsilont 870 and the other is Epsilont 805. Do you have replacement keys for these?

Yes, you may order replacement keys by visiting: https://www.posfellows.com/collections/accessories/products/epsilont-cash-drawer-replacement-keys-2-set

Will these keys fit any Epsilont cash drawer?

Yes, once you place your order on our website, we will call you to ask the lock number so we can ship you out the correct keys.

Will these fit any cash drawer

No, it would not. Please call us to discuss. Thank you.