Lots of research shows that most type 1 diabetics do, in fact, make a little tiny bit of insulin.
More controversial is evidence for and against that little bit mattering.

Most of the time, I see absolutely no evidence in my blood sugars of any making of insulin going on inside me.
I have never had insulin requirements anywhere close to low enough to qualify for any of the sorts of research studies that want definite honeymooners; my insulin needs have consistently been in the 0.7- 1.0 u/kg range.
I don't have the immunity from highs or lows that a cushion of making insulin brings. And I haven't been prone to bizarre unexplainable lows since my first two years on insulin.

But every now and then...

Yesterday at lunchtime I was low, which on NPH has been unusual (which is exactly the opposite of what I expected from NPH, but it  seems very little has happened as expected when I've changed insulins).
I ate 60 grams of uncovered carbs for lunch- a pita bread with jelly, plus pretzels with hummus. My blood sugar did not go above 100.
My supper blood sugar didn't go above 140. My overnight blood sugar stayed below 100.
Today after breakfast I went to 70, and I stayed between 70 and 100 until late afternoon, even though once again I ate an uncovered lunch. After work I ate 20 grams more uncovered and went up, but only to 160; I was down to normal range by suppertime. Blood sugar did not go up at supper. Around 9 PM I started thinking about a bedtime snack (on NPH I need one) and started wondering if I had taken my NPH. I don't remember doing so- I ate supper early so I may or may not have mixed the supper R with N.
My blood sugar took a dive so I ate that snack.

I keep checking my blood sugar because the CGM numbers look so unbelievable to me. My numbers haven't stayed so low for a two day period since before I started pumping.

There are explanations possible other than insulin production- in particular, I could have some previous site that's absorbing slowly, and I could just be more insulin sensitive and have used too high insulin doses and coincidentally eaten in ways such that the insulin release from injection sites was coinciding with the digestion.
I also could be digesting poorly- a distinct possibility.

Or hey- I could be minihoneymooning.