Our eBay Store Contact Us Add to Favorite Sellers 40-Count #10 Security Envelopes – Pack of 24 40 Pack, #10 White Security Envelopes, White Envelopes With Security Lining For Privacy, Boxed. 40 pack, #10 white security envelopes, white envelopes with security lining for privacy. K Hardware Stores is made up of 4 True Value Hardware Stores that have been in business for over 100 years. K Hardware understands customer service & quality products. Let us help meet your needs while in the comfort of your own home.