No wrong answers, and yours is a good one.

Photograph everything before you open it. Ten seconds, settles most disputes. Not on the import declaration but the pattern is familiar.

An inconclusive account is useful if it stops the next person mistaking a story for a controlled comparison.

Test one thing at a time. It feels slower and it is the only way to learn anything.

Bring a list. Embarrassment makes everyone forget things, including you.