Air carrier Ramp Lead reported a communication misunderstanding between the Ramp personnel and the gate CSA regarding the late arriving Dry Ice parcel and the missing NOTOC. After resolving the NOTOC issue the Ramp Person recommended refresher DG course.

Narrative

I was working a flight on Day 0; I pulled up NOTOC; at that point in time there was nothing on the NOTOC website. I then pulled my trip sheet; and it printed. At this point in time; the scanner did not show the flight having a NOTOC; the screen didn't turn yellow; and there was no verbal alert that happens every time a flight has a NOTOC. After briefing my crew; we went outside to start loading. It was a light load; but we still went out early; on the chance that upstairs would also get done early; and then we could push out early. We were already locked up; and a driver showed up with 4 boxes; which we accommodated. I saw the boxes were UN3373; which does not require a NOTOC. I looked at all 4 boxes and did not notice any other UN labels; so I scanned them and the crew loaded them. We then locked up again. At approx XA20; the tower added 20 minutes to the clock; and I received no communication from the tower or allocator as to why they added time. I went in the gate house to finalize the flight. When I got here; the phone was ringing (approx XB24) and the ramp manager asked me if the NOTOC was ready. I said we didn't have a NOTOC. She then told me that the CA (Captain) was calling and asking for the NOTOC paperwork. I logged in at a different computer than I checked the NOTOC first time; and it then showed the flight having a NOTOC. At this point; we re-opened the cargo bin; and upon a second viewing; I noticed one of the boxes had a dry-ice label. I went back in the building; and printed the NOTOC; and the ramp manager ran it up to the CA. I received a phone call at the gate house from the Captain around this time as well. He asked me where I was gonna put it; and I told him; and he said that was okay. He also told me that the flight was added into NOTOC system late. The whole time we were out there; no one informed me that they were waiting on a NOTOC. I didn't notice the dry ice label the first time; because I wasn't expecting a dry-ice label. I was also thinking to myself; even if it has dry-ice; it would be under the 2.5kg exception; which does not require a NOTOC. I showed the manager the building computer; which still did not have the flight on the NOTOC screen; this is after I printed the NOTOC.After the manager called me on the phone is when I noticed the NOTOC problem. After printing the NOTOC is when I noticed it was above the 2.5kg exemption.I will check NOTOC at exactly 60 mins on the clock; and not 1 minute too early. I will not accept NOTOCs if they show up late. I would like to have the DG (Dangerous Goods) refresher classes again; so I can have some fresh DG knowledge. If a NOTOC is planned late; it would be nice for the ramp-link to have an alarm and/or alert notifying me that a DG has been added for a flight. Communication from manager/Allocator/Tower telling me they were waiting for a NOTOC more than 6 minutes prior to departure would have also been appreciated.