Personally I like getting knives in nice wooden boxes but...... I use my knives and don't have a bunch in storage so a nice wooden box is really something that only delights me on getting the knife. A padded zippered pouch on the other hand is something that is useful long term. Its easy to pack should one want to travel and good if you have a stack of knives and want to store it.
I tend to ship knives between $250 and $400 with those ( padded zippered pouches ).
They are sold by a lot of knife suppliers. Here are some black ones.
https://knifemaking.com/collections/cases
For more unusual projects, I sometimes make a box but try to be a bit different about it. For example. Get a 4 x 4 and chisel it down into a shape you like. You can carve, burn, do all sorts of things to make it awesome. Then slice it in half length wise and hollow out with a router or chisels a place for the knife to go. Wrap the knife in nice leather, put it in and screw the two halves back together with nice brass screws, or wrap it in twine or leather chord or........
If you know your customer, make it fun for them.
I once made a guy a really expensive knife and put in it a nice natural wooden construct that required a very particular driver to unscrew. I knew he liked anticipation and challenge so I didn't send a driver. Once he got the box, he had to figure out what driver would open it and where to source it. He was delighted when he finally got it open
He's remained a good customer.