to seal or not to seal

this may have been talked about before. I may have missed it.

when dealing with rodents I don't like to seal anything up until I get a few days of trapping underway. after a few days i start sealing things up while I still have traps out. most of the time if I have a job where there is a few days work with exclusion.by the time I am done sealing up the house/building I may only need 1 or 2 trap checks and I am done (most of the time). The last two jobs have been a little different. 1st job I caught 28 rats in 2 visits and started sealing up and the numbers really did not drop off till the 5th day. I still have a few to catch but have stared having one or two of the rats that after they get caught they are being eatin by other rats. just skin and bones in the trap. 24 hour trap checks. this is in a 1800s house that is now offices. still have a few areas that need to be sealed but the death count as of today is 41. now this is adult and young along with 6 mice.
the other house has not been to bad but. caught most everything the first three nights and have everything sealed but there is still one or two left. every two or three days the home owner will show me where the rat has chewed the meaty part of dried turkey fans. him and his 3 kids are big turkey hunters. I have tried just about everything I can think of to catch this dang rat and he aint biting on nothing. snap traps next to the entry points that I could find and squirrel cages baited with black oil sunflower seeds and corn and peanut butter. even tried using the turkey fan bases in some bigger traps and nothing.
how would yall go about trapping this little bugger?

also what are yalls thoughts on sealing up entry points? do you like to seal right away or do you like to wait a few days?

Any chance of getting him to run through a Conibear. We use Provoke liquid bait in a T-Rex that is held inside a Protecta bait box with consistent cages on rats. I don't believe we have ever come close to having that many rats at a single job so I don't know how we would handle that. I know the guys like to seal right away but we're usually talking about a couple mice, not the Pied Piper collection.

What is the food source thAt there wod be over 40 rats in a office?

I only have done mice and I seal first then set a lot of traps, I contract to trap for 4 weeks so far this has worked good

Is it possible your last rat that is eating the turkey tail that you have a mouse left there?

there is a dog rescue place about 200 yards behind the house. I am thinking that is probly where the rodents are coming from or where they came from to begin with. tried talking to those folks as well about the rodents but yall know how that goes " we don't have a rodent issue".
good news is that I did catch a big one this morning that was 14 1/2 " long thinking that may have been one of the rats that was eating the other dead ones. only 2 caught today.

We seal immediately. If we canget them to stay outside its a body I don't have to deal with. Rats can chew into anything if they want to bad enough.

D-Con, or some other poison pellet's