Thanks for the thoughts. Police will not be involved.
I will not post the letter or write the full content here, but its tone is humorous and goofy and sweet, but for that one line, and she goes as far to say that I will never know who wrote it as she would be too shy and too 'nerves', but then gives a fake name and unlikely physical description and a place where she works.
She correctly uses to and too in all instances.
While there are spelling and grammar mistakes, there are also parts which seem more mature.
On the initial read, My impression was there was adult oversight with intentional mistakes, but not on the subsequent rereads.
I took a photo of it and texted it to my sister who then asked if I was armed, which I thought to be a complete overreaction.
My street is a fairly tight community on a dead end street, considering its location where people prefer to ignore each other. I am considering showing the letter to another resident mother who is one of the more logical and rational women I have known, and not so much a gossip.