A few afterthoughts: A young (slim) adult mouse would be the right size for your 4-5' corn snake. My largest (& oldest @ 20 years) corn snake is
about 6' long & could take a large mouse but he actually prefers small adult mice. My other 4 corns (fyi) are all 10 years old att.
Even though Corny's last shed was only about a month ago, it's "possible" (especially if he's been eating large mice) that he's already shedding again.
It's a "wait & see". Their sheds don't always happen on schedule.
Weighing your snake: in your case, it seems to be even more stressful to you than to Corny? I mean this with love: you lean towards being a "helicopter"
snarent, lol. Focus on his weight can mislead you: the amount of undigested food in his system or how much water he drank will just mess with your head.
Activity: Corny sounds perfectly normal to me. This time of year my corns (I have 5, currently) are active, climbing in their branches, hanging out, alert.
And honestly: rare is the snake-keeper that takes a snake to the vet for one missed meal. A couple meals would get my attention, but not just one. Relax.
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