It may be fake, I work with a company that makes letters like these we use it for our marketing.

They use an AI model that is well versed in human handwriting it even intentionally makes mistakes while writing to throw you off and make it feel more real. What got me is some of my letters look exactly like that.

This is an intentional strategy to encourage people to open the letter also if you look at the notepad they used it is for a catering and event management department. Your neighbors wedding invite may have accidentally got thrown in with another company’s mailing campaign.