You may not like this answer... but if the tree is more important than a bruised ego I would call the previous owner. You said he had the trees for years... he would be the best source for an opinion.
If you are not willing to call him...
I will suggest you call Daniel J. Hinkley...............
If you have lived in Bremerton a long time you might remember a cutting edge nursery named Heronswood in Kingston, WA. If you have not heard of it, or of Daniel, ask some older local gardeners... I cannot believe they have not heard of him.
Here is Daniel's website..................
https://danieljhinkley.com
and here is his phone number...............
(360) 297-4181
He and his nursery are in Indianola, WA
Judging from the maps that should be pretty close to you.
No kidding.... don't hesitate... call today................
that maple is probably more than capable of recovering
IF YOU DO NOT PROCRASTINATE.
Best wishes.......... that is a beautiful tree.
