LMM.ACCOUNT.BALANCES

When the MM contract matured, the relevant LMM.ACCOUNT.BALANCES (L Type in FILE.CONTROL) would be moved to History?

Please refer below the helptext.
LMM.ACCOUNT.BALANCES

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The LMM.ACCOUNT.BALANCES file contains the financial
information pertinent to all LOANS AND DEPOSITS & MONEY
MARKET contracts. There is only one version of the record and it
is established when a contract is first input and validated.

The information that this record contains can be classified into four
main sections:

(i) Principal movements over the life of the contract.

(ii) Interest accrual details.

(iii) Commission accrual details.

(iv) Funds paid/received on the contract.

All updates to this file are effected automatically by the system and
the only functions users are allowed to perform are (L)IST, (S)EE
and (P)RINT.

When a contract is written to history, either due to reversal or
maturity, its LMM.ACCOUNT.BALANCES record is also written to
history, although this may be "n" days after the reversal or
maturity (as per field DAYS.POST.MATURITY on
LMM.INSTALL.CONDS record).

The history file is named Fxxx.LMM.ACCOUNT.BALANCES.HIST - it's not the same as ...$HIS