IRS would notify you if it was an official communication. There'd be a long paper trail before any garnishment or levy took place. The IRS always tries to settle with taxpayer long before the issue comes up. You're being scammed.
Caller stated I needed to call b/c "the papers weren't signed at my residence or place of employment. I needed to set up appointment to do that. For some reason it came back undeliverable." I have no idea who "Associates" is!!!
Who are these people? Is this an instant garnishment from the IRS? Is your law firm involved with them. They did not identify themselves. "Darren Stone from the processing department Section 6334a section c forms to my Human Resources department. 970-429-5274"
I don't know about anyone else's HR department, but mine will not honor anything that has not been court ordered. I received a call and let it go to voice mail and no mention of the company's name or what it was for. Plus I don't think any company would honor it coming by fax either.