When did that happen?
I don't think Sierra's HPMK bullets ever went from coin, cup, draw, trim, heel, core and finally point machine went direct into green boxes. Nor did any retail lot have bullets from more than one such machine. I've toured both of Sierra's plants several times and there's 3 more stages they went through before going into green boxes.
Only their 1000 count brown box HPMK's sold at rifle matches bypassed those last three stages. They still had sizing lanolin on them but shot more accurate than those in green retail boxes. I've bought several 30 caliber HPMK ones in 168, 180, 190 and 200 grain weights; about 40% below retailed 100 count green boxed.bullets.
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These were "standards" that tested in the zeros and ones used as quality control tests in their rail gun test barrel's accuracy. I've chatted with Sierra's Martin Hull, Rich Maholz and Kevin Thomas about all this. Sierra stopped this direct sales program when they moved to Missouri. I was able to get two such boxes of 30 caliber 155s in 1991 as I helped develop 308 Win load data for their first production lot of that new Palma bullet before they were sold at retail.