Can this be obtained in a matte silver? May we receive a sample before purchasing? Thank You.

We do offer this size and shape in the Silver Foil for Laser. This does not, however, have the void tamper-evident film. You can review the material and pricing at the first link below. The second link provided will take you to our Sample Request page where you can request a few sheets for testing at no cost. https://www.onlinelabels.com/Products/OL1258SF.htm https://www.onlinelabels.com/samples

is this durable for outdoor use, like rain or shine, will it stay to stick on.

The Weatherproof Polyester Laser (LP) material is a very durable and water resistant material so the toner should not smudge or smear when wet. It has a strong permanent adhesive and can be used with most outdoor applications, however the toner used in standard laser printers is not UV resistant so exposure to direct sunlight for an extended period of time could cause fading. You could potentially treat the labels after printing with a UV protective spray like Krylon's UV-Resistant Clear Coating to improve durability in direct sunlight. You are welcome to visit the link below to request free samples for testing with your application. https://www.onlinelabels.com/samples

Will this work on cardboard boxes or boxes that have a shiny outside?

The Void Silver Polyester (VS) has a permanent adhesive that works well on most surfaces. However, we have not tested this for cardboard or coated boxes. With that in mind, we'd recommend requesting samples at the link below to test with your application. https://www.onlinelabels.com/samples