Was it creepy to use a friend's address from a form to send him a T-shirt?

I’m trying to get an outside perspective on something I did in a friendship. I want an honest assessment, including if what I did was genuinely creepy or inappropriate.

A friend and I were living together at the time. I had to sign a form that required a witness, so I asked him to witness my signature. As part of the form, he had to provide his address on the form.

About a month later, we were both working remotely and living separately. We were joking about a particular T-shirt, and I decided to send the shirt to him as a surprise.

The way I got his address was by getting the form from my bag and looking at his address. I did not ask him for his address again or tell him I was going to use the address from the form.

He thought this was creepy, specifically because I had gone back to the form and gotten his address from there for a completely different purpose.

I understand why he could see that as a boundary issue. The address was given to me in the context of witnessing a form, not for sending him things. At the same time, the purpose was a T-shirt related to a joke between us, and I wasn't trying to track him, investigate him, or find out where he lived. I just thought it would be funny to send a friend a gag gift and thought "huh he gave me his address on a form a month back...I can just use it and the gift will remain a surprise". We had also lived together previously.

So I'm trying to understand the outside perspective:

Was this actually creepy behavior, or was it more of a socially inappropriate/boundary-crossing thing that I should have handled differently?

I'm not looking for people to automatically side with me. If most people would find this genuinely creepy, I'd like to understand why.