are they still active?  registered with state yet ?   Do you know of any of the

banks they used when they did pay you?    If so, a judgment may be collectable.

One trick I learned years ago, both from companys and tenants in my rentals,

I make a copy of any check they pay with for my records, (not each time, but

only when they give me a new check on a different account).  That way I

have the bank's address, routing #, account #, etc...  One never knows when

such info may come in handy in later days, in case the relationship goes

South (without paying of course).