Casually I have found such recurring order in 2checkout:
1. It's not stopped (active)
2. it's declined
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Decline Status: Decline Jan-20-07 Auto-retry Jan-27-07
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"Auto-retry" date was long time ago !

3. this order is NOT listed in list of my Declined orders!
https://www2.2checkout.com/2co/admin/declined_recurrings

4. And this order is not listed in list "Recurrings To Bill "
https://www2.2checkout.com/2co/admin/recurrings_to_bill

So this order is totally lost !
This customer is hosted for free, and I don't know how many such free customers I have......

Somebody had such issues ? How to resolve it ? How to find such orders?

Their support can't help:
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"Per my system, it shows auto billed several times and the error message is NO ACCOUNT, you may stopped the recurring billing or contact them directly and or sent them separate invoice to bill for the services rendered."
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Do you keep all emails from 2CO? Search your inbox and see if you received any notice about this order.

2CO doesn't handle recurring billing failures gracefully. If a billing attempt failed, they will only retry when user updates the CC info, or twice a month by the system if I recall correctly. If all attempts failed, the order will not be cancelled automatically and will be in this "unpaid" state forever.

In short, 2CO handles recurring orders poorly (ie. incomplete callback/API, no automatic cancellation on failures, (rare) missing payments etc).

What billing software are you using? Try to contact the vendor if you use a 3rd party software. I can provide more tips if you code your own billing system.

We am not using separate billing system,
I trusted to 2checkout billing...
I thought all declined orders will be listed in their "Declined" list.

Yes, I see email about this order "Vendor Notification: Your 2Checkout Order: XXXXXXXX"
They tried to charge it on Dec 30, Jan 6, 13, 20.
That's all.

No more emails, order disappeared from all stats.

Whenever you receive a billing failure notice, note the order on your calendar and manually cancel it after X days if no payment is received (login to 2CO, find the order, and click "Stop recurring").

Fortunately I had "Vendor Notification: ...." and "Billing canceled" emails from middle of 2005,
(total about 12000 emails)
our programmer made special program to check order numbers automatically and I have such results:
about 350 my customer don't pay me........

Hey, somebody here from 2checkout?
In your system are thousands of non paying customers, your vendors and you lose big money...

Make the special program check regularly, and remove non-paying customers.

2CO doesn't lose anything, they just don't earn the commissions. It's you who loses money, so do whatever you can to prevent it.