I don't know, but it is possible they retain.
I heard of a kingsnake that had been left alone for seven years that laid a clutch, one of which hatched. That case may have been cloning, though.
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3.0 WC; 0.2 CB L. getula californiae
0.1 WC; 0.0.10 CH Elgaria multicarinata multicarinata