[mothered]

but there are various nuances to boxing. For example, using just an empty box/package, dry ice, modifying the label, beating up the box, double taping, filling with sand and holes, combinations of the above, etc.

Yes, I'm well aware of the methodologies used when boxing.

In terms of "filling with sand", It's futile If the company checks the package on receipt.

What kind of situation makes dry ice not suitable?

One of countless examples (and stating the obvious), Is If the Item Is light enough to not register a weight on consignment, then dry Ice Is not required when boxing.