Your search for "mr56-box" revealed the following:
NEW Cisco Meraki MA-MNT-MR-14 Mounting Kit for MR55/MR56 Series Access Points
SKU: NSN-5983
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 178.99
• Only 2 remaining
Call if you need more
Cisco Meraki MA-MNT-MR-9 Mounting Kit for MR52 MR53 MR53E Series Access Points
SKU: NSB-8532
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 59.99
• 45 in stock
Call if you need more
NEW Cisco Meraki MA-MNT-MR-17 Mounting Kit for MR36 Series Access Point
SKU: NSN-0077
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 139.99
• 16 in stock
Call if you need more
NetworkTigers MA-MNT-MR-15-NT-WALL Wall Mount Kit for Meraki MR44 MR45 MR46 AP
SKU: NSB-3890
Condition: New
Shipping: Overnight Options
Warranty: 365 days
$ 49.99
• 89 in stock
Call if you need more
Cisco Meraki MA-MNT-MR-17 Mounting Kit for MR36 Series Access Point
SKU: NSB-8730
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
$ 129.99
• 7 in stock
Call if you need more
Cisco Meraki MR56-BOX Genuine Box
SKU: NSB-9935
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
Cisco Meraki MA-MNT-MR-14 Mounting Kit for MR55 and MR56 Series Access Points
SKU: NSB-8529
Condition: Seller refurbished
Shipping: Overnight Options
Warranty: 365 days
NEW Cisco Meraki MA-MNT-MR-9 Mounting Kit for MR52 MR53 MR53E Access Points
SKU: NSN-9341
Condition: New
Shipping: Overnight Options
Warranty: 365 days