The party which loudly demands answers from everybody else is proving remarkably shy as it is engulfed in another cash controversy.
Sinn Fein is offering neither adequate information nor explanations as to why the £30,000 in Covid support grants wrongly paid to it six months ago was only returned this week.
The legitimate questions powerfully posed by the BBC's Stephen Nolan Show were met with radio silence on Wednesday.
There are no suggestions that the Shinners were up to any mischief in securing the money. The payments to the party's three offices were automatic and unsolicited under Stormont's Small Business Support Grant Scheme.
The sole issue is why it took half a year to return them. With so many ordinary people struggling and public funds scarce, it's not a good look.
One £10,000 grant was repaid on Monday, the other two on Tuesday. The question is, had Nolan not been onto it, would the money have been repaid at all?
Sinn Fein isn't having a good pandemic. At the outbreak of the Covid-19 crisis in March, the party took the moral high ground and portrayed itself as caring more for public health than the other Stormont parties. Alone, it called - rightly in my view - for schools to be immediately closed.
It's been all downhill since the Bobby Storey funeral four months ago, when Sinn Fein showed that it wouldn't abide by the rules it set for the rest of us.
Still, the Covid support grants is a much less damaging story for the party than the funeral.
Even if they believe Sinn Fein would never have returned the £30,000 without Nolan's interest, most nationalists will view the sum involved as small beer compared to the millions lost in the cash-for-ash scandal.
Yet it does give the party's opponents ample opportunity to portray it as an elite which acts differently to everybody else. "One rule for Sinn Fein and another for ordinary people," declared Colum Eastwood on Wednesday.
The fact that Sinn Fein has form on such matters doesn't help. As the SDLP leader pointed out, a 2014 BBC Spotlight programme revealed that Sinn Fein MLAs had claimed almost £700,000 in expenses for research from a company that was run by the party's own finance managers.
Just a fortnight ago, Sinn Fein hit the headlines for saying that up to €4 million it inherited would be spent only in Northern Ireland. Englishman William Hampton left the money in his will to "the political party in the Republic of Ireland known at this time as Sinn Fein".
While the party didn't act in breach of donations laws, it was accused of skilfully using the border to avoid donation limits in the South.
When it came to returning the Covid grants which mistakenly landed in its bank accounts, Sinn Fein appears not to have been as au fait with financial procedures.
MLA Maoliosa McHugh, whose constituency office was one of those to incorrectly receive the funding in the Spring, said the party had "great difficulty contacting Land and Property Services (LPS) at the time and getting it paid back to them".
Mr McHugh sits on the finance committee at Stormont, where LPS chief executive Ian Snowdon appeared last week. It would have been so easy to raise the matter with him.