Ferguson TO 20, Kubota B3300, BH77, Massey Ferguson 1540
Welcome, you got a great deal with all those attachments and a 40 hp tractor with low hours! Perfect for your property and future plans. Good luck in the future.
I'm certainly no authority on the subject but I think you got a fantastic deal. For comparison I just bought a B2320 from a friend with a 4 ft brush hog, wheeled landscaping "York" rake, back blade, 60" belly mower, trailer mover, and ratchet rake for 13K. Mine is a 2013 with now 210 hours. I have a couple minor dents and dings and fading as it was not garage kept (it is now) but it is a machine, not a show piece.
You have a much bigger tractor with more expensive implements. To me, the hours are a wash as with care, your Grandkids will use it after you're gone. Another plus for both of us is knowing the previous owner. Don't think twice about whether you made a sound investment - you did great!