about 10-20 years ago, i went back and forth carrying large sums of travelers checks. first biggest problem was to get a customs agent to meet me to get the forms done.

second problem was, once i finally got forms filled out and filed, i frequently was pulled out of line and patted down if i had not filed forms.

the largest tc at that time was $100 as i recall. i would have at least a 3-4" stack of those things. not something one can easily hide.

point is, i was marked and tracked.