Goslin, Paul wrote:

It probably depends on your library.... It will most likely place the
tape into the next available slot.
Our library (a DELL PV136T) would not recognize a cleaning tape until I
put a barcode on it... This was after I opened a case with Legato
support to ask how to insert/set a cleaning cartridge (They seemed to
have no idea what to do, could not tell me how to do it , except for the
nsrjb -U command)...
At first:
To get it into the last slot of the library, I had to fill up the first
59 slots, then insert/deposite the cleaning tape....

or you could run:  nsrjb -dN -S60

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