Since they're well established adults I wouldn't offer any more often than every 3-4 weeks. I'm brand new to Morelia, but with my other snakes sometimes I just kinda "wait them out". By that I mean I don't offer until they start exhibiting some hunting behavior.
For example, with my adult BPs, when they take a break I won't offer again until I see their heads poking out of their hides on consecutive nights. If I see that two or three nights in a row I will offer. So far I've had no refusals that way.
Again, I'm brand new to Morelia, but experienced with other species and this is what has worked for me personally as well as my animals.
Good luck! Please keep us posted.
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