If you end up in an area you’re not supposed to be in, it’s likely not an intended feature of the game. Communcating that violates the forum rules as it falls within exploit territory. It also spoils future content. Therefor, I’ve removed the post.
@Gysbert Hey, I just saw what you posted back in march about the lumber tags.
The tags are there to mark which owner the lumber came from. When the logs arrive at the sawmill, they can see who the forest owner was and where to send the payment.
The number is probably a customer number at the sawmill, or some kind of registry number on a local farm. The letters could simply be the initials of the owner.
Haha, No unfortunately, I’m pretty sure that there are some at the bottom of the farmlands region, south of the airbase. The military was apparently digging for gold.
Or you could try to find one closer
Edit: ermm… I have the date wrong. I looked at the date of a photo I made of the dumping stations, but I forgot that I jumped the fence. It must have been made accessible with the may '21 update.