What about a smaller gift basket? I just got a similar gift basket so I'm going to share what I got and some stuff I think people would like for their buns.
I got: pomegranite infused craisins, papaya tablets, benebac, a small bag of different hay, baby keys to play with, two balls that are hard plastic with holes, a small slinky.
Maybe to add to the basket: a small bag of sample food, some dried papaya bites, different craisins or raisins, banana chips, one of those fold up/collaspable cat tunnels, a willow ball or a few, a grass hut or a willow tube.
And other small things that would fit in a smaller box to ship wherever.
If emergency items wanted to added into the treat basket, then you could do something like this: vet wrap, benebac, simithecone, plain pumpkin, iodine, neosporin. Simple items to get people started with their first aid kits or to add to their first aid kits.
Those are just my ideas!