Hi everyone! I’ve visited this forum as a guest for years, but today I finally registered and this is my first post. 
I have a question about grading WOTC-era box toppers (Legendary Collection, e-series). I have about 10 of these in my childhood collection. They are in really good condition, despite not ever being sleeved. I’d like to send them all in for grading. I’ll probably use Ludkins for PSA grading.
My question is, what’s the best way to protect these box toppers during shipment? Are there specific sized “penny sleeves” and toploaders that have just the right dimensions for these cards? I know I could just buy any random large-sized sleeves/toploaders, but I’m concerned about unwanted card movement during shipping. Perhaps someone here who has experience sending these cards in might have specific product recommendations. Thanks!