Question about tolls in Florida?

Ok, so last week I went on a road trip to Florida and on my way back, I made a stop through an exit and when I tried to get back on the Hwy, there was this toll which didnt have a cashier and which accepted only dollar coin (which I didnt have) but offered an envelope with an address to mail my $1 money order to within 10 days, but the thing is I lost that envelope and had the proper address and dont know how to retrieve it. thanks