Prism-like hard cube found in the grass of a local park

Found a sealed bag of small threaded plastic sleeves, bolts, and slotted/curved metal tabs in my newly purchased home.

Upon moving in to a new home I found this bag, sealed, in the garage. They obviously all go together for something but I can’t figure out what, and am scared to throw away because I’ll of course immediately realize they were important and I need them. The white pieces don’t expand or move at all when the bolts are screwed in, and yes the bolts fit into the slots in the metal.

Round yellow soft foam honeycomb, 3" diameter and 1/2" thick. Possibly purchased from a pet store. Very light weight. It was placed in a rat's cage, and the chew marks are from the rat. We are worried that it killed the rat and so we are trying to figure out what it is.

Found this small white fiberglass-like tube with a cotton interior today near a foundation. One of them was burned on one end. There were numerous of them and all were very small.

Does anyone recognize this? It’s maybe made of tin or something? Found it while metal detecting in an area that goes back to the 1860s. Has images of a dog, cat, and rabbit around the edge. It is very thin metal and light weight. I’d say it’s about 3 inches in diameter.

Small white boxes scattered throughout conference area in hotel. MAC addresses visible.

Looks like a MAC address on the top left of these little boxes. They were scattered around the conference center of a large hotel. No power sources visible. I'd see one in basically every hallway and conference room. Reverse image search wasn't turning up anything substantial. Thanks!

What is this giant metal thing I’ve seen all over Portland, OR?

Plastic accordion-like collapsible plastic container inside of new lunch box

This thing came inside a lunch box I bought today. It’s about the height of a Can of soda and the diameter of like a donut. It can fully compress and is made of fairly flexible plastic.

Ministry Of defence UK - Daily Ukraine update 08.09.2023

My mom and dad are constantly donating money and stuff to our warriors. So one of the friends at the front decided to give the opportunity to pass messages for the orcs. Proud of my parents! 💙💛

Translation in comments

Leonid Kadenyuk (the one holding the Ukrainian flag with his left hand) was the first astronaut of independent Ukraine who flew into outer space. He flew on NASA's Space Shuttle Columbia in 1997 as part of the international mission STS-87