I believe Personna packages these razors for several retailers... Very common practice for manufacturers... (I work in food manufacturing, we make products even for our competitors)
I bought my first M5 at Rite-aid also, didn't realize till I got home that it said rite-aid on the back and nowhere did it say Personna... but it did have "American Safety Razor Company" on the back, the company that IS "Personna"
I've noticed that our local FREDS discount chain store has a "Freds" brand M5, same exact packaging....even Freds refills,,, $4.50 for 4 blades !!
Also... Be sure to go to the Personna website and submit a product review, I got a thank you note AND .... TWO packs of refills sent to me in the mail for taking the time to provide them product feedback....
When I run out of free blades, I plan on buying the "Freds" labeled refills....