Air Carrier Maintenance Stock Clerk reported being notified of Hazmat packaging violation a week after violation occurred. Stock clerk requested more clear and concise packaging information.

Narrative

On Date I processed 2 separate Hazmat items going to ZZZ for stock replenishment. I had them to be picked up by [shipping company] the next morning and delivered over the next days. I signed into our Hazmat shipping procedure program and gathered all the materials required. The materials available to me for cushioning was corrugated paper in abundance. Procedural verbiage in one of these parts allows for 'any cushioning material' as per IATA standard and then lists examples: foam sheets; bubble wrap. My understanding of these mentioned items was that they were examples; so I used what was readily available. The other part did not have any specific mention of packing materials and furthermore in the packing instructions; says 'bubble wrap or other cushioning material.'The discovery of 'improper cushioning material' was made aware to me by Name; Supervisor on Duty during a meeting he set up after our briefing on 2nd shift on Date 1; over a month after ZZZ had received my shipments. My understanding of 'any material' is not restrictive; I used what is available. The clerk in ZZZ did not know what the corrugated paper was.During this meeting; I requested of Supervisor on Duty to please email the procedures department to get clear instructions in their procedures if we are restricted to use only certain materials.