Yes u are correct and I have noticed very poor quality buttons and boxes for sale the last 5 years !!!
I been horting up all the US stuff I can find to serve me and whoever I pass my stuff on to one day !!!
I have a nice US made collection of boxes and points to serve all my applications if u are ever out and find old engines and can obtain caps and buttons alot of times its older Made in USA stadard ignition products which sadly are made in China now.