You just keep thieving, if your invent is full and steal from the master farmer if you have the seed in your invent and you steal that seed you'll get the seed else you don't get a seed. For example before you start the bot you withdraw 1 of every herb seed into your invent. Start the bot and disable banking. The invent will fill up with random seeds and herb seeds once the invent is full, keep pickpocketing the farmer as normal and the seeds you already have will go in your invent and you'll keep getting all the seeds you want. Any seeds you pickpocket e.g. potato that you don't have in your invent and the invent is full you won't get you still steal them and get xp but no seed is given. So remove that if statement in the code at the moment, if banking is disabled && invent is full just keep pick pocketing