Uzbek customs declaration

Thats very simple, just declare all your foreign currrency and valuables, then spend your money using the black market or not. When you leave the country fill in an other form with the money thats left. That means you should not have more money when leaving the country!
So if you withdraw from an ATM be sure to get and keep the receipt!

As #1 says, the rule is to check if you have more money when leaving than if you entered, i.e. worked or sold a child to slavery. They don't care how much money you spent in the country.

Keeping that in mind, do your best not to get stuck with too many sum at the end of the trip as you will have to exchange them back at a horrible rate.

Thanks to you both. Just to be absolutely clear, if I arrive with $2000 and leave with $500 no-one is going to ask for foreign exchange receipts to account for the missing $1500?

No

I declared my currency upon entering/leaving Uzbekistan but it was never checked or counted by anybody.

I also declared everything whem I entered and left and no one checked anything. No one checked my OVIR registrations either.

I also declared everything whem I entered and left and no one checked anything. No one checked my OVIR registrations either.

#s 5 & 6.
You were lucky!
I was checked at Tashkent airport and thoroughly. (But not rubber gloves and bend down thoroughly)
I had forgotten about the law about taking out more dollars than I had brought in and had to hand over money. Thankfully, they allowed me time to give it to a representative for the tour agency who put the money towards the next step of my tour in CA.

That was January 2009. Unlesss there has been any great changes since then, I guess the moral is do not expect to get through without checks.