I wonder the same thing also. If you own source code you could try debugging it. If not I would log a case with infor - I am sure they could provide some information or queries on how to locate what might still be open. In our 20 years or so of usage we never did run the archiving processes.
My latest mantra - make sure you have latest stpapi patches and the latest session object. If on LN then please explore the option of using DAL2 functionality.
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