Missing source files of several products

"pert" has explained very well here (http://forum.arduino.cc/index.php?topic=559429.msg3818022#msg3818022) but as a reminder I post it here.

Following product pages don't offer source files (some haven't been released and that could be understandable yet but some have already been):

- ~~https://store.arduino.cc/usa/mkr-proto-shield~~
- ~~https://store.arduino.cc/mkr-sd-proto-shield~~
- ~~https://store.arduino.cc/arduino-mkr-can-shield~~
- ~~https://store.arduino.cc/arduino-mkr-485-shield~~
- ~~https://store.arduino.cc/arduino-mkr-mem-shield~~
- ~~https://store.arduino.cc/arduino-mkr-connector-carrier~~
- ~~https://store.arduino.cc/arduino-yun-rev-2~~
- ~~https://store.arduino.cc/arduino-uno-wiFi-rev2~~
- ~~https://store.arduino.cc/arduino-mkr-nb-1500~~
- ~~https://store.arduino.cc/arduino-mkr-eth-shield~~
- ~~...and the MKR Motor Carrier which is only sold within the Engineering Kit (why!!??)~~
- ~~https://store.arduino.cc/usa/arduino-fio~~
- ~~https://store.arduino.cc/usa/shield-xbee~~
- https://store.arduino.cc/usa/shield-proto-pcb-rev3
- https://store.arduino.cc/usa/arduino-materia-101-assembled
- https://store.arduino.cc/arduino-pro-gateway
- ~~https://store.arduino.cc/nano-33-ble-sense~~
- ~~https://store.arduino.cc/nano-33-ble~~
- ~~https://store.arduino.cc/nano-33-iot~~
- ~~https://store.arduino.cc/nano-every~~
- ~~https://store.arduino.cc/nano-33-ble-sense-with-headers~~
- ~~https://store.arduino.cc/nano-33-ble-with-headers~~
- ~~https://store.arduino.cc/nano-33-iot-with-headers~~
- ~~https://store.arduino.cc/nano-every-with-headers~~

On the other hand, following product pages only offer schematics:

- ~~https://store.arduino.cc/arduino-mkr-wifi-1010~~
- https://store.arduino.cc/arduino-vidor-4000

There was also a report that the Arduino Industrial 101 .DSN files are only schematics, not board design files: https://forum.arduino.cc/index.php?topic=483772.msg3302961#msg3302961 (this board isn't marked as retired like Tian or others...)

Start by reviewing the remaining product pages listed in the issue, especially Shield Proto PCB Rev3, Materia 101 Assembled, Pro Gateway, and Vidor 4000, along with the linked forum reports. Determine which products lack source or board-design files and whether their release status is documented. Done means the listed omissions have been resolved or their status is clearly recorded.

Written by the indexing model from the issue text.