Texas is the second largest state in the United States.
Delaware is the second smallest.
Texas has 254 counties- the most in the country.
Delaware has 3(!)- the least in the country. I'm not sure if there is a "Delaware County Challenge" cache but it could probably be completed by lunch.
Houston is Texas' largest city. It has 2.3 million people.
Wilmington is Delaware's largest city. It has a population of 73,000. If you put Wilmington in Texas it would be the 49th largest city- between Missouri City and Temple.
There may or may not be a saying in Delaware: "Nothing is bigger in Delaware".
You are looking for a Delaware-sized container (a magnetic nano) in Clay County- Texas' 50th largest county. Clay County is smaller than Delaware. (I looked it up)