mapping (address => uint112) public incentives;
...
function recoverTokens(address token, address recipient) public lock {
...
		if (incentives[token] > 0) {
			...
			uint256 excess = ERC20(token).balanceOf(address(this)) - incentives[token];
			...
		}
mapping (address => uint112) public incentives;
mapping (address => uint112) public airdrops;
...
function recoverTokens(address token, address recipient) public lock {
...
    if (incentives[token] > 0) {
        ...
        uint256 excess = ERC20(token).balanceOf(address(this)) - incentives[token];
        ...
    }
    if (airdrops[token] > 0) {
        ...
        uint256 excess = ERC20(token).balanceOf(address(this)) - airdrops[token];
        ...
    }
...
// we do know what airdrop token will be gathered
function arbitraryCall(address who, bytes memory data, address token) public lock externallyGoverned {
    ...

    // get token balances
    uint256 preDepositTokenBalance = ERC20(depositToken).balanceOf(address(this));
    uint256 preRewardTokenBalance = ERC20(rewardToken).balanceOf(address(this));
    uint256 preAirdropBalance = ERC20(token).balanceOf(address(this));

    (bool success, bytes memory _ret) = who.call(data);
    require(success);
    
    uint256 postAirdropBalance = ERC20(token).balanceOf(address(this));
    require(postAirdropBalance <= type(uint112).max, "air_112");
    uint112 amt = uint112(postAirdropBalance - preAirdropBalance);
    require(amt > 0, "air");
    airdrops[token] += amt;
