March 6th and 10th:

https://www.cnbc.com/2020/03/06/people-are-stealing-face-masks-from-local-hospitals-gov-cuomo-says.html

https://www.cnbc.com/2020/03/10/people-stealing-hand-sanitizer-and-surgical-masks-from-doctor-offices.html

https://www.businessinsider.com/people-stealing-masks-from-hospitals-and-research-facilities-2020-3

https://www.msn.com/en-us/health/video/surgical-face-masks-on-lockdown-as-thefts-are-reported-across-the-country/vp-BB110uM4

https://www.advisory.com/daily-briefing/2020/03/17/sanitizer-theft

March 30:

https://www.vox.com/policy-and-politics/2020/3/30/21199538/coronavirus-mask-trump-new-york-hospital-stealing

https://www.politico.com/states/new-york/albany/story/2020/03/30/de-blasio-trumps-suggestion-face-masks-are-being-stolen-is-insulting-1269555

https://www.nbcnews.com/politics/politics-news/no-evidence-trump-s-suggestion-masks-are-going-out-back-n1172251

https://abcnews.go.com/Politics/cuomo-york-hospitals-reject-trumps-claim-masks-back/story?id=69877209

https://www.factcheck.org/2020/03/trump-vs-cuomo-round-2/

https://www.dailymail.co.uk/news/article-8169883/Donald-Trump-doubles-claim-masks-going-door-hospitals.html

https://www.theguardian.com/world/video/2020/mar/30/maybe-worse-than-hoarding-trump-implies-hospital-staff-stealing-masks-video