Ich verstehe nicht.

From the article:

According to the reports, soldiers failed to unload part of the train carrying over 1,000 tons of explosives in total, and the anti-tank mines continued to circulate around the country before they went missing.

Maybe Ikea needed the space to transport something, so they unloaded everything forgotten on the train.

Militaries surprisingly frequently loose weapons around the world:

• https://taskandpurpose.com/news/lost-stolen-military-weapons/
• https://nationalinterest.org/blog/reboot/us-military-missing-six-nuclear-weapons-180032

Or they just wanted to support SCP-3008, but accidentally sent to a normal ikea ;)

He was drunk only once?

• This is his edit on the wiki page of Missouri from the day of this tweet: https://en.wikipedia.org/w/index.php?title=Missouri&oldid=693016799
• He replaced an svg with png, so he didn’t even know how to properly fake a map
• His username was Robwhisman, he had only one edit on wikipedia, when he replaced the map. https://en.wikipedia.org/wiki/Special:Contributions/Robwhisman
• I suspect he was not found via this tweet, but his account was a fresh registration with only a single edit, most suspicious. Amateur vandal. Professionals lurk with small changes for years, than slowly ramp up to bigger levels, like the teenager who faked an entire language on wikipedia for years, and noone noticed his edits are just gibberish: https://www.theregister.com/2020/08/26/scots_wikipedia_fake/ He was caught after 10000 articles, not after a single edit.

I think he tried to create some faraday cage?