About 2.5 years back, while carrying open in my local Fred Meyer, a manager came to up to me while I was shopping.
He just wanted to make contact and let me know another customer had raised concerns.
Before he talked to me he verified by calling the Sheriff's office that it was legal, and confirmed FM corporate goes by state law.
He said there were no problems, just wanted to give me a heads-up in case the other customer should make a stink about it.
Remember, Portland (not sure about Gresham) has an unloaded open carry ordinance, but a CHL exempts.