Are you using the skills such as discerning eye, impulsive appraisal, methodical appraisal etc? To be able to collect and item you must first use these skills to increase the rairity of the item, then collect. (Don't go over the 30 durability or you will have a 5% chance to gather.) A typical rotation would be discerning eye than methodical appraisal two to three times (assuming you are below 60) to get the rarity needed to turn in. Hope that helps.