Due to the "variablity" of the nozzle test prints, I would say either your head(s) are clogged, or you purge unit (tubing and a peristaltic vacuum pump below the purge pads) is non-performing The purge pads are the porous ceramic pads where the print head "parks" when not printing. You can see...
Great that you posted a nozzle test print! DON'T PRINT ANYTHING OTHER THAT NOZZLE TEST PRINTS UNTIL THE PROBLEM IS RESOLVED!
What printer is it (we recognize it's a Canon)?
What ink are used (supplier)?
Where did you obtain the "refurbished" print head??
Any significant nozzle test print...
I can't get Five Star brand hot dogs out here (the Slovenian Sausage and Irish Bangers are to die for)!
https://www.fivestarbrandmeats.com/
AND... advice, NEVER go to the West Side Market when hungry!
http://westsidemarket.org/
A nozzle plate stamp test in order. If yellow is present, you probably have an electronic issue.
If you beleive the yellow channel is obstructed, you can also try this method, although there is some risk of nozzle plate damage if too much force is used, and it WILL be messy.
Get a cheap...
USPS spying? That's giving them a LOT of credit!
As for "declaring value", it's needed for insurance purposes only. Otherwise perhaps it's needed for overseas shipment, but they don't check. Why lie anyway?
I've had reliable delivery from them (squezzyfill bottles, printer potties and such). They shipped from the UK.
What form is the tracing number? Does a US delivery system recognize it (eg, USPS)?
Yeah, but the state closed the "open container" law about a decade ago. Did you "participate" in the Tour de Laramie (bike ride from bar-to-bar until...) while in school here?
Heck, the pot's cheaper on UW's campus anyway, so the WHP doesn't catch much on the way up from Colorado. The "legal stuff" does come "nicely packaged", though...