found in civil war camp.back of the button says superior quality extra rich i think. i dont know what the other object is but it looks like it got u . s on it.
Your "mystery item" looks like the aluminum "U.S." miniature canteen novelty lock made by the Slaymaker-Barry Co., c. 1891-1900. It was a trick lock, which could be opened by pushing a lever on the bottom. If it were in good, working condition, it would be worth around $200-250.
The bird button looks like a 19th century sporting button.
The other button is a U.S. Army "Great Seal" general service button, c. 1902-present. Based on the backmark, I would agree that it's from the WWI period.