I grew up in the sticks and being around tools and shit was very normal. Often rusty just from age and use. Lots of remains of old sheds or torn down houses etc out in the woods too, or active projects on your own land, barbed wire, etc. To me it doesn’t seem unusual at all to see or be around that sort of stuff and we were always up to date on our tetanus shot because of it. Even just getting poked by a tree branch or something is a tetanus risk, any puncture wound should be treated as one