strategy for catching them...
a pickup truck
cracked corn or scratch
probably 2 XL or XXL dog crates, preferably wire type, not the fully enclosed type (fully enclosed is a little safer for them in transport, but much harder to herd them into becasue it's enclosed and dark inside) ... I've had 4 full grown chineese geese in a large crate and that was pretty crowded, you might be able to stuff 8 in an XL cage, but they'll be squished and I don't think it would be safe.
some wire grid fencing - 10' per side would give you plenty of room to herd with. cattle pannels (or sheep or hog panels) would work best because it's rigid and won't roll up or sag.
Tposts or some way of supporting the ends. if the geese are as friendly and as hungry as they look, you might be able to use people to hold up the ends.
set it up like a funnel - the pair of crates at the point, panels as wings.
pour out some of the grain starting in the back of the crates, make a fair little pile of it. they may just come right into the crates to get it... depending on what they're used to. if they don't come in, pour a little tiny bit in front of the crates, and scatter a tiny amount in the runway between the pannels. you want to give just enough to get them to move up, with most of it near or in the crates... the more that you put down at the wide end of the funnel, the harder it will be to get them to move forward.
have your herder person (or two) come around behind them giving them plenty of room and using spread arms as they walk gently on to encourage them up into the crates. might want to have the herders carry a cane or broomstick in each hand to extend their reach and herding range.
if you've got a 3rd cattle pannel, you can use it to close off the open end of the funnel to keep the geese from scooting out once they catch on that they're being herded into crates.
geese are easy to herd, but you don't know how these have been treated, they may be crate shy, or used to crates, or just not have a clue. take your time, go slow enough you don't panic them, and you'll have a lovely flock of geese to take home!
wishing you good luck, so glad they've found a home. I'd SO be there with you if I was closer.