Tag your old articles on Pocket as "bolso-furado"
Install the gem:
$ gem install bolso-furado
Create a Pocket application.
Get consumer key and token (if you don't have one, use bolso-furado-token script).
Run script with consumer key and token:
$ bolso-furado -k 68583-ceb7f902cac956bc671bd299 -t 91142ba0-acfb-373c-735c-8e072b -d 20
21 item(s) untagged
17 recent item(s) untagged
4 item(s) tagged as bolso-furado
Day parameter is optional. Default will be 30 days.