Completely fine to ask for proof that the seed round happened, especially as the first employee. I had the [dis]pleasure of having a co-founder that would routi

Completely fine to ask for proof that the seed round happened, especially as the first employee. I had the [dis]pleasure of having a co-founder that would routinely lie to people about past investment, investor interest etc. If only I was smart enough not to trust that person myself... Just honestly voice your concerns (rather than saying "show me the proof" without explaining why) and any reasonable person will only have more respect for you for asking.