They sell slabbed sized display boxes as well.
Graded Sports Card Display Case Lockable,Trading Card Collector Wall Display Holder for Baseball Basketball Football Hockey Cards, 98% UV Protection Acrylic(Black) https://www.amazon.com/dp/B08RC6ZWSG/ref=cm_sw_r_cp_api_i_P9F2QPPDTFNRK1E8VJHG?_encoding=UTF8&psc=1